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Condensed Consolidated Statement of Equity (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($)
Total
Common stock
Retained earnings
Noncontrolling interests
Balance, Beginning of Period at Dec. 31, 2014 $ 80,752,791 $ 61,942,410 $ 18,818,263 $ (7,882)
Balance, Beginning of Period, shares at Dec. 31, 2014 17,118,993 17,118,993    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share-based compensation $ 426,651 $ 426,651    
Share-based compensation, shares   86,102    
Exercise of options and related tax benefit 491,950 $ 491,950    
Exercise of options and related tax benefit, shares   3,256    
Repurchase of shares (4,669,873) $ (4,669,873)    
Repurchase of shares, shares   (712,134)    
Net income (loss) 542,512   580,292 (37,780)
Balance, End of Period at Sep. 30, 2015 $ 77,544,031 $ 58,191,138 $ 19,398,555 $ (45,662)
Balance, End of Period, shares at Sep. 30, 2015 16,935,764 16,496,217